Squiggle is a special-purpose coding language for generating probability distributions, estimates of variables over time, and similar tasks. It was developed by the Quantified Uncertainty Research Institute.
The official basics guide[1] is a good written guide if you have experience programming and/or have a specific project in mind already.
There’s also a few simple worked examples on the forum to demonstrate squiggle’s value[2], and a more complex model based on GiveWell's cost effectiveness analyses[3].
Note that squiggle is still in development and has several known bugs[4].
Squiggle official website.
Squiggle basics guide
Squiggle components: tools to implement squiggle into websites
Squiggle Tweaker: Simple squiggle visualiser
Squiggle to Graph [WIP]: generate visual dependency graph of squiggle code
list of tools for Collaborative Truth Seeking | guesstimate | QURI | cause prioritisation